﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;

namespace Xceed.Silverlight.Data
{
  internal class DeletedItemPositionConverterEnumerator<T> : ItemPositionConverterEnumerator<T> where T : RawDataItem
  {
    #region Constructor

    internal DeletedItemPositionConverterEnumerator( 
      IAsyncEnumerator childEnumerator,
      IContextualItemHelper<T> itemHelper )
      : base( childEnumerator, itemHelper )
    {
    }

    #endregion

    protected override bool Convert( ItemPosition itemPosition )
    {
      T item = itemPosition.Item as T;

      if( item == null )
        throw new ArgumentException( "The specified ItemPosition must be a RawDataItem instance.", "itemPosition" );

      return item.IsDeleted;
    }
  }
}
